The clue is a synonym.

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Across
  1. 2. seduce
  2. 4. before
  3. 5. diverse
  4. 7. unchanging
  5. 9. likely
  6. 10. department
Down
  1. 1. multiple
  2. 2. follow
  3. 3. shape
  4. 6. group
  5. 8. chemistry